Erratum: Exciton spin decay in quantum dots to bright and dark states [Phys. Rev. B<b>76</b>, 195324 (2007)]

Roszak, Katarzyna; Axt, Vollrath M.; Kuhn, Thomas; Machnikowski, Paweł

doi:10.1103/physrevb.77.249905

Cited by 29 publications

(44 citation statements)

References 1 publication

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“…Dark excitons become visible after introducing a mixing between bright and dark configurations, either by an in-plane magnetic field 9,10 or by the exchange interaction with magnetic dopant 11 . The lifetime of the dark exciton is widely believed to be determined by a spin-flip process turning a dark exciton into a bright one 6,[12][13][14] . The main argument for such a mechanism is a biexponential decay of the bright exciton, which was observed in both III-V and II-VI QDs 6,15 .…”

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confidence: 99%

In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

et al. 2012

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We demonstrate evidence for a radiative recombination channel of dark excitons in self-assembled quantum dots. This channel is due to a light hole admixture in the excitonic ground state. Its presence was experimentally confirmed by a direct observation of the dark exciton photoluminescence from a cleaved edge of the sample. The polarization resolved measurements revealed that a photon created from the dark exciton recombination is emitted only in the direction perpendicular to the growth axis. Strong correlation between the dark exciton lifetime and the in-plane hole g-factor enabled us to show that the radiative recombination is a dominant decay channel of the dark excitons in CdTe/ZnTe quantum dots.

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confidence: 99%

In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

et al. 2012

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“…Two further exciton states with angular momenta ±2 can be formed from the lowest single particle states, which are usually referred to as dark excitons as they cannot be excited directly by the laser field. A relaxation into these dark states requires spin flip processes that take place on a time scale of typically longer than a nanosecond [28,29,30] or relaxation from energetically higher excited states [31]. Therefore, they are not relevant for state preparation schemes occurring on a time scale of at most a few tens of picoseconds and will not be considered in this review.…”

Section: Quantum Dot Modelmentioning

confidence: 99%

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Reiter

Kuhn

Glässl

et al. 2014

J. Phys.: Condens. Matter

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Abstract. For many applications of semiconductor quantum dots in quantum technology a well controlled state preparation of the quantum dot states is mandatory. Since quantum dots are embedded in the semiconductor matrix, the interaction with phonons plays often a major role in the preparation process. In this review, we discuss the influence of phonons on three basically different optical excitation schemes which can be used for the preparation of exciton, biexciton, and superposition states: a resonant excitation leading to Rabi rotations in the excitonic system, an excitation with chirped pulses exploiting the effect of adiabatic rapid passage, and an off-resonant excitation giving rise to a phononassisted state preparation. We give an overview over experimental and theoretical results showing the role of the phonons and compare the performance of the schemes for state preparation.

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“…We propose a mechanism for the Mn-hole flip-flop at low temperature resulting from a deformation induced exchange interaction 41,42 . We show here that Mn-hole states are efficiently coupled via the interplay of their exchange interaction and the lattice deformation induced heavy-hole/light-hole mixing.…”

Section: Modelling Of the Dynamics Of The Hybrid Mn-hole Spinmentioning

confidence: 99%

Resonant photoluminescence and dynamics of a hybrid Mn hole spin in a positively charged magnetic quantum dot

2017

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We analyze, through resonant photoluminescence, the spin dynamics of an individual magnetic atom (Mn) coupled to a hole in a semiconductor quantum dot. The hybrid Mn-hole spin and the positively charged exciton in a CdTe/ZnTe quantum dot forms an ensemble of Λ systems which can be addressed optically. Auto-correlation of the resonant photoluminescence and resonant optical pumping experiments are used to study the spin relaxation channels in this multilevel spin system. We identified for the hybrid Mn-hole spin an efficient relaxation channel driven by the interplay of the Mn-hole exchange interaction and the coupling to acoustic phonons. We also show that the optical Λ systems are connected through inefficient spin-flips than can be enhanced under weak transverse magnetic field. The dynamics of the resonant photoluminescence in a p-doped magnetic quantum dot is well described by a complete rate equation model. Our results suggest that long lived hybrid Mn-hole spin could be obtained in quantum dot systems with large heavy-hole/light-hole splitting.

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Erratum: Exciton spin decay in quantum dots to bright and dark states [Phys. Rev. B76, 195324 (2007)]

Cited by 29 publications

References 1 publication

In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Resonant photoluminescence and dynamics of a hybrid Mn hole spin in a positively charged magnetic quantum dot

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